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1

VariousDNAcontent in myotube nuclei during myotomal myogenesis in Hymenochirus boettgeri (Anura: Pipidae)

100%
Daczewska M., Saczko J.
Folia Biologica
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2003
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vol. 51
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issue 3-4
151-157
EN
During myotomal myogenesis in Hymenochirus boettgeri primary myoblasts differentiate into morphologically and functionally mature, mononucleate myotubes. Further muscle development in the studied species is due to fusion of mesenchymal cells with the latter, resulting in the presence of two classes of nuclei in the myotube: large of myotomal origin and small of mesenchymal origin. Densitometric measurements of DNA content revealed that the myotube nuclei at stages 35 reached values close to 4C DNA (3, 3C DNA), while at a later stage (42) the values were equal to 4C. Conversely, the secondary myoblast nuclei following the fusion with the myotube at stage 42 had 2C DNA ? a content comparable to that found in erythrocyte nuclei. PCNA (Proliferating Cell Nuclear Antigen) ? marker of S-phase of cell cycle, detected in the myotube nuclei (at stages 35, 42) appears during DNA replication.
2

Myotomal myogenesis in Triturus vulgaris L. (Urodela) with special reference to the role of mesenchymal cells

100%
Daczewska M., Kielbowna L.
Folia Biologica
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2000
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vol. 48
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issue 1-2
37-42
EN
Two stages can be distinguished in the differentiation of myotomal muscle fibres in Triturus vulgaris. In the first stage only synchronously differentiating myotomal cells are engaged; in the second stage mesenchymal cells also take part in the process. Myotomal cells (primary myoblasts) fuse to form 2-3 nucleate myotubes. Only in the caudal part of the embryo mononucleate myotubes persist. The mononucleate myotubes, like polynucleate ones, occupy the whole length of the myotome. The differentiation of myotubes is accompanied by vitellolysis. At further development stages mesenchymal cells enter the intermyotomal fissure, after which they migrate to the myotomes, between the myotubes. The cells that remain in the intermyotomal fissures retain their fibroblastic potential (they synthesise collagen). Their daughter cells adjoining the myotubes acquire myogenic abilities. Their myoblastic potential is evidenced by their ability to fuse with the myotube. Fusion of secondary myoblasts (of mesenchymal origin) with the myotube results in further growth of the myotubes. In T. vulgaris myotomal myotubes and muscle fibres developing from them are of myotomal-mesenchymal origin.
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